No brakes lights, need ideas - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gigem · 04-21-2013, 11:51 AM

Switch is bench tested good
Bulbs are bench tested good, both filaments
Rear running lights work fine
Rear turn lights work fine

No brake lights. When i had the switch removed for testing, I also tried jumping the wires at the switch plug, no joy.

I suck at wiring. Any ideas?

A ground somewhere?
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BLE 'BURBAN · 04-21-2013, 01:16 PM

Check your fuse?

**hatzie** · 04-21-2013, 01:29 PM

The ground is shared by all 6 bulbs in the tail... The turnsignals work so the filaments will light.

The 4-way hazards work??? No? Replace the STOP HAZ fuse.

Turn signal stalk set to fully cancelled position??? Brake lamps go through the turnsignal switch.

Gigem · 04-21-2013, 01:51 PM

Fuse was it. Thanks guys!
Posted via Mobile Device

Gigem · 04-21-2013, 03:03 PM

Spoke too soon... Fuse is symptom, not root cause. Replaced fuse, and it blew as soon as I stepped on the brakes. 20A fuse. Hazards did not blow fuse. Ideas?
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**hatzie** · 04-21-2013, 05:32 PM

The White wire from brake light to turnsignal switch is probably chafed and grounding either between the brake pedal and the harmonica connector on the bottom of the column. OR. Between the harmonica connector and the turnsignal switch inside the column.
My money is on the short White wire inside the column.

463 · 04-21-2013, 05:59 PM

Quote:

Originally Posted by hatzie

The White wire from brake light to turnsignal switch is probably chafed and grounding either between the brake pedal and the harmonica connector on the bottom of the column. OR. Between the harmonica connector and the turnsignal switch inside the column.
My money is on the short White wire inside the column.

X2 - there is a short > and you have a tilt colomn right?

Gigem · 04-21-2013, 09:07 PM

Quote:

Originally Posted by 463

X2 - there is a short > and you have a tilt colomn right?

Yes, I do have a tilt column...

**hatzie** · 04-22-2013, 01:58 AM

If it's in the column you'll have to pull the turnsignal switch assembly off far enough to reach the wires.

You should be able to carefully release the terminal from the harmonica connector, slip the WHITE wire up and out of the column with a string tied to it and slip a piece of heatshrink over the wire or paint on several layers of liquid electrical tape to cover the damaged PVC insulation Then pull it back in using the string, and latch the terminal back into the harmonica.

It's not as bad as it sounds just time consuming and fussy.

All of the 1980 GM factory service manuals are in my sig.

463 · 04-22-2013, 10:49 AM

I have had the white wire right at the harmonica connector crack enough wires for it to fail and the plastic cover hold it on.
hatzie has a good idea also.

Jonboy · 04-22-2013, 11:52 AM

Mine was a problem at the long connector also. The wire on mine backed out, and wasn't making contact. I would start at that connector.

**hatzie** · 04-22-2013, 05:04 PM

You can find the 1980 tilt column on PG 6-42 & PG 6-43 in the 1979-1984 GM 52A Light Truck Parts-Illustration books. Follow the links to GM parts wiki host site for our square body parts manuals.

If the wiring is too far gone... The GM-AC-Delco turnsignal switch part # for your 1980 Tilt Column is 1997985. You can buy that AC Delco switch, brand new, on Amazon for $20.

http://www.amazon.com/ACDelco-1997985-Switch-Assem...
Make sure the plastic wiring protector is in place and the wires are running along it instead of rubbing on the internals of the column.
Automatic protector is GM # 7828270
Manual protector is GM #7817247

04-21-2013, 11:51 AM	#1
Gigem Registered User Join Date: Feb 2012 Location: Lakeway, TX Posts: 335	No brakes lights, need ideas Switch is bench tested good Bulbs are bench tested good, both filaments Rear running lights work fine Rear turn lights work fine No brake lights. When i had the switch removed for testing, I also tried jumping the wires at the switch plug, no joy. I suck at wiring. Any ideas? A ground somewhere? Posted via Mobile Device __________________ 1972 GMC Sierra Grande (current truck) 1980 Chevy Stepside (gone) 1987 Chevy Blazer (gone) 1972 Chevelle SS Convertible (gone) 1973 Chevy Corvette (gone) 1967 Chevy Camaro (STOLEN!)

04-21-2013, 01:16 PM	#2
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: No brakes lights, need ideas Check your fuse? __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

04-21-2013, 01:29 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: No brakes lights, need ideas The ground is shared by all 6 bulbs in the tail... The turnsignals work so the filaments will light. The 4-way hazards work??? No? Replace the STOP HAZ fuse. Turn signal stalk set to fully cancelled position??? Brake lamps go through the turnsignal switch. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-21-2013, 01:51 PM	#4
Gigem Registered User Join Date: Feb 2012 Location: Lakeway, TX Posts: 335	Re: No brakes lights, need ideas Fuse was it. Thanks guys! Posted via Mobile Device __________________ 1972 GMC Sierra Grande (current truck) 1980 Chevy Stepside (gone) 1987 Chevy Blazer (gone) 1972 Chevelle SS Convertible (gone) 1973 Chevy Corvette (gone) 1967 Chevy Camaro (STOLEN!)

04-21-2013, 03:03 PM	#5
Gigem Registered User Join Date: Feb 2012 Location: Lakeway, TX Posts: 335	Re: No brakes lights, need ideas Spoke too soon... Fuse is symptom, not root cause. Replaced fuse, and it blew as soon as I stepped on the brakes. 20A fuse. Hazards did not blow fuse. Ideas? Posted via Mobile Device __________________ 1972 GMC Sierra Grande (current truck) 1980 Chevy Stepside (gone) 1987 Chevy Blazer (gone) 1972 Chevelle SS Convertible (gone) 1973 Chevy Corvette (gone) 1967 Chevy Camaro (STOLEN!)

04-21-2013, 05:32 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: No brakes lights, need ideas The White wire from brake light to turnsignal switch is probably chafed and grounding either between the brake pedal and the harmonica connector on the bottom of the column. OR. Between the harmonica connector and the turnsignal switch inside the column. My money is on the short White wire inside the column. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-22-2013, 01:58 AM	#9
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: No brakes lights, need ideas If it's in the column you'll have to pull the turnsignal switch assembly off far enough to reach the wires. You should be able to carefully release the terminal from the harmonica connector, slip the WHITE wire up and out of the column with a string tied to it and slip a piece of heatshrink over the wire or paint on several layers of liquid electrical tape to cover the damaged PVC insulation Then pull it back in using the string, and latch the terminal back into the harmonica. It's not as bad as it sounds just time consuming and fussy. All of the 1980 GM factory service manuals are in my sig. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-22-2013, 10:49 AM	#10
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: No brakes lights, need ideas I have had the white wire right at the harmonica connector crack enough wires for it to fail and the plastic cover hold it on. hatzie has a good idea also. __________________ Trueman

04-22-2013, 11:52 AM	#11
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: No brakes lights, need ideas Mine was a problem at the long connector also. The wire on mine backed out, and wasn't making contact. I would start at that connector.

04-22-2013, 05:04 PM	#12
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: No brakes lights, need ideas You can find the 1980 tilt column on PG 6-42 & PG 6-43 in the 1979-1984 GM 52A Light Truck Parts-Illustration books. Follow the links to GM parts wiki host site for our square body parts manuals. If the wiring is too far gone... The GM-AC-Delco turnsignal switch part # for your 1980 Tilt Column is 1997985. You can buy that AC Delco switch, brand new, on Amazon for $20. http://www.amazon.com/ACDelco-1997985-Switch-Assem... Make sure the plastic wiring protector is in place and the wires are running along it instead of rubbing on the internals of the column. Automatic protector is GM # 7828270 Manual protector is GM #7817247 __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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